package com.permgmt.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @author LIAO
 */
public class TimeUtitl {

    /**
     * 获取当前时间
     *
     * @return
     */
    public static String dateTime() {
	Date date = new Date();
	SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	String timeFormat = simpleDateFormat.format(date);
	return timeFormat;
    }

    public static String getTime() {
	Date date = new Date();
	SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
	String timeFormat = simpleDateFormat.format(date);
	return timeFormat;
    }

    /**
     * 计算年龄
     *
     * @param birthDay
     * @return
     * @throws Exception
     */
    public static int getAge(Date birthDay) throws Exception {
	Calendar cal = Calendar.getInstance();
	/** 出生日期晚于当前时间，无法计算 */
	if (cal.before(birthDay)) {
	    throw new IllegalArgumentException("出生日期晚于当前时间，无法计算!");
	}
	/** 当前年份 当前月份 当前日期 */
	int yearNow = cal.get(Calendar.YEAR);
	int monthNow = cal.get(Calendar.MONTH);
	int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);
	cal.setTime(birthDay);
	int yearBirth = cal.get(Calendar.YEAR);
	int monthBirth = cal.get(Calendar.MONTH);
	int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);

	/** 计算整岁数 当前日期在生日之前，年龄减一 当前月份在生日之前，年龄减一 */
	int age = yearNow - yearBirth;
	if (monthNow <= monthBirth) {
	    if (monthNow == monthBirth) {
		if (dayOfMonthNow < dayOfMonthBirth) {
		    age--;
		}
	    } else {
		age--;
	    }
	}
	return age;
    }

    /**
     * 把出生日期字符串转换为日期格式。
     *
     * @param strDate
     * @return
     * @throws ParseException
     */
    public static Date parse(String strDate) throws ParseException {
	SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
	return sdf.parse(strDate);
    }
}
